[PATCH] Maybe fix PR87134

Gerald Pfeifer gerald@pfeifer.com
Thu Sep 6 16:25:00 GMT 2018


On Wed, 5 Sep 2018, Richard Biener wrote:
> So I'm testing the following then, leaving the placement new untouched
> (no init is fine) and then assign from vNULL.
> 
> 2018-09-05  Richard Biener  <rguenther@suse.de>
> 
> 	PR bootstrap/87134
> 	* tree-ssa-sccvn.c (rpo_elim::eliminate_push_avail): Make sure
> 	to zero-init the emplaced vec.

Unfortunately it does not fix the build on i586-unknown-freebsd10.4.

(Yes, I am trying various things to nail this one down and provide
more input or make it reproducible for you, alas without success so
far.)

Some things I found is that 

 - building for i686-unknown-freebsd10.4 instead of 
   i586-unknown-freebsd10.4 does not make a difference.
   (I tried, since Jeff referred to successful i686 builds).

 - not just builds with the system compiler (clang 3.4.1) fail, 
   but also those with GCC mainline from 20180827 do -- with the 
   same failure mode.

Gerald



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